science

Glutamate synthase

Glutamate synthase is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Glutamate synthase rather than just read about it. In short: Glutamate synthase (also known as Glutamine oxoglutarate aminotransferase) is an enzyme and frequently abbreviated as GOGAT. This enzyme manufactures glutamate from glutamine and α-ketoglutarate, and thus along with glutamine synthetase (abbreviated GS) plays a central role in the regulation of nitrogen assimilation in photosynthetic eukaryotes and prokaryotes.

Key takeaways

Glutamate synthase belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Glutamate synthase to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Glutamate synthase from memory before moving on to harder problems.

Reference excerpt

Glutamate synthase (also known as Glutamine oxoglutarate aminotransferase) is an enzyme and frequently abbreviated as GOGAT. This enzyme manufactures glutamate from glutamine and α-ketoglutarate, and thus along with glutamine synthetase (abbreviated GS) plays a central role in the regulation of nitrogen assimilation in photosynthetic eukaryotes and prokaryotes. This is of great importance as primary productivity in many marine environments is regulated by the availability of inorganic nitrogen. The primary sources of inorganic nitrogen used by marine algae are nitrate and ammonium. Both forms are ultimately incorporated into amino acids through the sequential reaction of glutamine synthetase (GS) and glutamate synthase (glutamine:2-oxoglutarate aminotransferase; GOGAT). GOGAT isoenzymes catalyze the transfer of the amido nitrogen of glutamine to 2-oxoglutarate using pyridine nucleotides (NADH-/NADPH-dependent) or ferredoxin (ferredoxin dependent) as reductants. They are called NADH-GOGAT and Fd-GOGAT respectively. In photosynthetic eukaryotes, GS and GOGAT isoenzymes are localized in the cytosol and chloroplast. Fd-GOGAT is found strictly in cyanobacteria and photosynthetic eukaryotes, and the gene is located in the chloroplast of rhodophytes and in the nucleus of vascular plants, but in both cases its product is active in the chloroplast. NADH-GOGAT is found in the nucleus of vascular plants, fungi, and diatoms, while NADPH-GOGAT is found in non-photosynthetic bacteria and archaea.

See also Glutamate synthase (NADPH) Glutamate synthase (NADH) Glutamate synthase (ferredoxin)

References

Worked examples

Example 1 — a first encounter with Glutamate synthase

Start with the simplest possible case. Write down what Glutamate synthase claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Glutamate synthase before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Glutamate synthase ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Glutamate synthase

In research: Glutamate synthase appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Glutamate synthase in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Glutamate synthase is common in secondary-school and first-year university syllabi. It links to neighbouring topics Enzymes, so understanding it makes those chapters shorter.
In everyday life: Look for Glutamate synthase outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Glutamate synthase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Glutamate synthase means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Glutamate synthase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Glutamate synthase in simple terms?

Why does Glutamate synthase matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Glutamate synthase?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Glutamate synthase.